The A123 are // connected with the stock nimh using a contactor and a fuse.
They have a bms.
Le LG are connected on the A123 via a dc-dc converter in order to control their current. They are energy cells, not power one, unlike the A123.
All these cells are grid charged using a 2kW elcon charger.

Bms+ is needed in order to be able to use more then the stock 6.5Ah.

For this trip, I use only 80 Wh/km, then 16,7kWh come out of the battery.
Max speed was 85 km/h, average between 45 and 50 km/h.

Actually the system is not finished. I put the LG on the nimh cells.
For small trips they are removed.

...Have you done anything special to prevent the engine from starting? Or did you just drive with a careful right foot?

Glad you found us!

Merci, MetroMPG.

Yes, I use a mode called "out of gas".
At the begining of each trip I open, using a relay, a wire, during a second or less.
So the prius think there is no engine ! say no gazoline.
This special mode was designed by toyota !
For exemple in case your gas tank is empty. When this append all prius 2 drive in electric mode to ... may be the next gas station... or not.
But with the stock battery you will not drive a long distance, except if the road goes down. If the battery is at the normal soc (State of charge=63%) 2km on a flat road only. 4km if the battery was fully charged (80% soc).

So they decide that the speed limit in this mode will be 85 km/h.
In this mode power max is near 22kW with a 25kW boost and peek over 32 kW.
To leave this mode you have to stop the car and power off/on.

I use this mode very often because no gas is used and you can use your right foot as you like. You can also use the B mode, a mode with more regen then the D mode. You have all the system on (brake, power steering, clim... except heating)

When the trip will be long, I use the normal hybrid mode. It is a mixed mode in wich you use the engine time to time and the electric motor. One alone or both at the same time. The best is to use the engine if high power is needed and electric under.

The actual 20kWh picture is:

So, after having used my Prius in eco mode using sometime hypermileur techniques, giving à 3.7L/100km, I decide first to add 4.5kWh
This is the picture you inserted in my first post.
The gas consumption was reduced to 2.2 L/100km
The year later I added 4.5kWh more then have 9kWh.
Then the gas consumption was reduced to 1.2 L/100km.

9 kWh with box wires, contactor etc is about 80kg.
100km was possible in electric mode.

This year I added the LG cells, less then 45kg and 9.8kWh.
Now I only "fill" with 10L the gas tank, and only when needed.

I also replaced the old lead acid 12v that was 7years old with 4xA123 20Ah and a capacitive bms. 8kg less then before and no problem at all because the prius voltage never goes over 14.1 volts.

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Regen is really better than with only the nimh cells because two reasons:

-The total electrical resistance is then only 0.04 ohms because during driving the nimh are // with the A123 (Lifepo4). Usually nimh alone have 0.3 ohms (In summer).
-And you can charge all the cells. If the A123 are not fully charged you can charge several kWh during a slope. With the nimh only 0.4kWh for exemple.

So the nimh don't heat like previously and the A123 stay at a good temperature.
They don't need to be cooled (I don't live in a hot place)

In out of gas mode there is a third interesting reason,
because you can use the B mode at any speed without loosing power in the engine. I often use this so my mechanical brakes are often just for a final stop, less then 20 km/h. In B mode you can have twice the electrical braking power then in D mode. You can mix from D to B mode during braking. Maximum electrical braking (regen) is near 28kW.

(Converting a car from gas to electric is quite impossible here in France, because laws)

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I get the first 70 in France and the 70 others a year later in china (Pm me for the seller name please).
Today the china seller have only cells without tabs. They are good one but it is a very big job to connect them. Really prefer cells with tabs, half of full tabs; less job, more easy to remove, same metal...probably longer life
My A123 cells don't have tabs. Avoid cells with tabs soldered.
I have connected the cells using screws and plates.
This job must be very well done. You can have burst up to 200A, but average near 40A in my case. The cells have only 7.2mm thickness, so you don't have much space for electrical insulation.

The 18650 LG are connected using spot welding. This is easy to do. You have just to be more carefull on the plus pole.

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Did you spot weld 936 LG 18650 cells together? Eeew... what a lot of work!
Those are lithium oxide? How do you protect them?

I'm looking for a small PHEV parallel pack on my Insight, just to boost FE not go full electric (the EV motor on the Insight is too small for that anyway).
I'm thinking LiFePO4 and about 1-1.5 kWh, portable, charging at home and at work.
Any advice?